Teenths to samuel leseh



" (N l.) 2 Sheets-Sheet'i.

G. W..PIUKETT.

ATTACHMENT FOR ELECTRIC GENERATORS.

Patented Sept. 24, 1895.

WITNESSES. mwmm.

INVENTOI? ATTORNEYS.

(No Model.) 2 Sheets-Sheet 2. G. W. PICKETT. ATTACHMENT FOR ELBUTRIG GENERATORS. I No.'546,901. Patented Sept. 24, 1895.

e e (N WITNESSES: INVENTOH ATTORNEYS.

ANDREW BJHIMMM, PHOTOJJTNQWASHIN GTON U B ilnr'rnn STATES T FFTQEG GEORGE \V. PIOKETT, OE DENVER, COLORADO, ASSIGNOR OF NINE-SIX- TEENTHS TO SAMUEL LESEM, OF SAME PLACE.

ATTACHMENT FOR ELECTRlC GENERATORS.

SPECIFICATION forming part of Letters Patent N 0. 546,901, dated September 24:, 1895.

Application filed January 12, 1395. Serial No. 534,655- (No model.)

To aZZ whom it may concern:

Be it known that I, GEORGE W. PICKETT, of Denver, in the county of Arapahoe and State of Colorado,have invented new and Improved Attachments for Electric Generators, of which the following is a full, clear, and exact description.

My invention relates to improvements in attachments for electric generators which are to be used in connection with reciprocating plungers and which are especially adapted to work in connection with solenoid or other magnets oppositely arranged and adapted to reciprocate between them a plunger which can be utilized for working a rock-drill or equivalent piece of mechanism.

The object of my invention is to produce a very simple apparatus, which can be attached to an ordinary dynamo and arranged in such a way that the pulsating current is sent through the oppositely arranged magnets. The circuit in one is broken, while it is closed in the other, so that, being alternately energized, they will keep the plunger or armature in rapid reciprocating motion.

Another object of my invention is to provide a very simple and positive gear mechanism which rotates the commutator which gives a pulsating current in such a manner that it will move slowly while the voltage between the two revolving brushes is at the maximum and rapidly when it is at the minimum, causing the brushes to pass off the halfring of the commutator at the lowest voltage, in order that little spark may be made, and in order, also, that the magnets in connection with the dynamo may have sufficient time to act Well on the plunger.

To these ends my invention consists in certain features of construction and combination of parts, which will be hereinafter described, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar figures and letters of reference indicate corresponding parts in both views. 7

Figure 1 is aperspective View of a common form of dynamo provided with my improved attachments, and Fig. 2 is an enlarged detail longitudinal section of the main and auxiliary commutators of the dynamo.

The dynamo 10 may be of any usual form, as the generator or dynamo proper constitutes no part of my invention, and it has the usual armature-shaft 11, on which is a commutator 12, which is like the ordinary commutator, except that it is made in two separate sections, as shown in Fig. 2, between which sections is arranged a bearing-sleeve 13, (see Fig. 2,) adapted to rest in the bearing 14 of the machine. The two end sections of the commutator are connected by wires 15, which, as illustrated in Fig. 2, lie in grooves of the bearing-sleeve 13, but may be extended through the shaft 11 in any usual manneigif preferred.

The machine is provided with a common form of brush-holder 16, which carries brushes 17, from which the current is taken and transmitted through wires 18 in the ordinary man ner, which wires may be made to run a series of lamps or to carry a current for any usual purpose. The above construction, with the exception of the two-part commutator, forms no part of my invention. An auxiliary commutator 19 revolves on the outer end of the commutator 12, and thus the inner end portion of the commutator is left free for the usual brushes 17. The commutator 19 has its body portion formed of insulating material, while on its exterior surface is a whole contacting ring 20 and a half-ring 21, these being insulated from each other, and the two rings are electrically connected with the contactbrushes 22, which ride on diametrically-opposite sides of the commutator 12 at the outer end of the same, the said brushes having concave inner ends which fit the commutator, and they are movable in and out in keepers 23, which may be secured to the commutator 19 in any convenient manner, so that both keepers and brushes will revolve together, while the brushes are free to move in and out.

The brushes 22 are backed by insulatingblocks 24., which are pressed inward by a fiat spring 25, the ends of which press against the blocks. A brush 26 contacts with the whole ring 20 of the auxiliary commutator 19, and from this brush the wire 27 and branch wires 28 lead and connect with the solenoid-magnets A and l which are shown only in diagram, as they may be arranged in any convenient or necessary manner. The half-ring 21 contacts with diametricallyoppositely-ar ranged brushes 29 and 29, which are supported in any convenient way, and it will be seen that. the half-ring can only contact with one brush at a time. One of these brushes connects by a wire 30 with the magnet A, while the other connects by a wire 31 with the magnet 13. It will be seen that as the commutator revolves a constant current will pass from the brush 20 through the wire 27, and when the brush 29 is in contact with the half-ring 21 the current passes through the magnet. A and wire to the brush and half-ring, thus energizing the said magnet; but on the next halfrevolution the half-ring is in contact with the brush 29, so that the magnet A is (lo-energized and the current passes through the wire 27, one of the branch wires 28, the magnetB, the wire 31, brush 2i and the half-ring 21. It is desirable to give an irregular movement to the auxiliary commutator, so that the said auxiliary commutator, revolving brushes, and the contact-rings will travel slowly while at the highest voltage and then faster while the brushes are passing on and off the half'ring at the lowest voltage, and to this end the auxiliary commutator is provided with an elliptical gear 32, which is driven by an elliptical pinion 33, the gears of course being arranged at right angles to each other-that is, the shorter diameter of the pinion being in alignment with the longer diameter of the gear 32. The pinion is carried by a shaft 31-, which is parallel with the armature-shaft ll, is journaled in suitable bearings 35, and is driven by a beveLpinion 36, meshing with a pinion 87 on a vertical shaft 38, which is supported on suitable bearings and is driven by a wormwheel 39, meshing with a worm 10 on the armature'shaft.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. The combination, with adynamo having the usual commutator, of an auxiliary commutator having whole and half contact rings in connection with the main commutator, a pair of brushes oppositely arranged to contact with the half ring, a brush to contact with the whole ring, and mechanism for givseaeoi ing an irregular speed to the auxiliary commutator, substantially as described.

2. The combination, with a dynamo and its commutator, of an auxiliary commutator rcvolving on the main commutator, whole and half rings on the auxiliary commutator, electrical connections between the said rings and the main commutator, brushes to successively contact with the half ring, a brush to contact with the whole ring, and a gear connection between the auxiliary commutator and the armature shaft of the dynamo, substantially as described.

3. The combination,with a dynamo and its commutator, of an auxiliary commutator on the main commutator, whole and half contact rings on the auxiliary commutator, electrical connections between the said rings and the main commutator, a shaft parallel with the armature shaft Etllt geared to the auxiliary commutator, a second shaft having a worm gear connection with the armature shaft, and a gear connection between the two shafts, substantially as described. i

4t. The combination,with a dynamo and its commutator, of an auxiliary commutator revoluble on the main commutator and provided with whole and half contact rings, an elliptical gear rigidly connected with the auxiliary commutator, an elliptical pinion to drive the gear, and an operative driving con ncction between the said pinion and the armature shaft of the dynamo, substantially as described.

5. The combination with a dynamo, of a two-part commutator having separated ends, a bearing sleeve between the ends, and an auxiliary commutator revoluble on one end of the main commutator, substantially as described.

6. The combination, with the main comm utator and the revoluble auxiliary commutator mounted upon it, of mechanism to turn the auxiliary commutator, whole and half contact rings thereon, oppositely arranged brushes carried by the auxiliarycommutator and rotating on the main commutator, and elliptical gear for driving the auxiliary commutator, substantially as described.

GEORGE W. PICKE Witnesses:

BENJAMIN W. Wtsnnaur, ALnnn'r ll. BAKER. 

